[Octave-bug-tracker] [bug #59370] Plotting produces wrong output or takes long time, depending on graphics toolkit

[T Knauss]

Follow-up Comment #4, bug #59370 (project octave):

Update: Due to the weird behaviour when switching graphics toolkits, and due
to the contrary behaviour of "fltk" to other people's tests and its
implementation, I tested again.
This time I switched to "fltk" as first step, directly after opening Octave
GUI. Then I created S and called "plot(S)". The plot was incomplete in the
same way as in the screenshot attached to the original post.

My conclusion: It looks like there are serious issues when switching the
graphics toolkit. These issues seem to affect performance and output. Most
likely there is no proper cleanup routine, or the switching itself does not
work correctly and maybe forgets important initialization steps.

The performance issues persist, without an obvious pattern. Some plots are
shown immediately, some take 10 to 20 seconds.
As long as I use the default graphics tookit ("qt"), no delay is seen. The
delays come up after switching the graphics toolkit.

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